Electric signaling system



April 2, 1946- H.M.M. DAssls-FoNsEczA ET AL 2,397,596

ELECTRIC SIGNALING SYSTEM Filed Feb'. 27, 1943 A will... 1|` n n 5m mm mfr@ n WI/2,. Nwm M .1,4 m. MJ T MH A M H.

Patented Apr. 2, 1946 ELECTRIC SIGNALING SYSTEM Harold Muntioy Muschnmn dASSiSL-Fonscca' and Hushl Jennings. Ward, Londen W C- 2., Ensland, -ass gnovrs, b y, mesne assignments, to Infe ternatimonaly Standard Electric Corporation,

New York, N. Y., a corporation of Delaware ApplicationFebruary 27, 1943, SerialfNo. lfl'jlA In Great Britain April14,r19,42

(ci. muses);

Claims.

This invention relates to electric signaling systemsand will be described in its application to electric power supplynetworkslwhere equipment, suchas circuit brefalfrers,y located remotelyrfrom a control station, has tobe controlledfromy that central` station. By way of example, mention may bemade ofl our prioriBritish patent specifications Nos. 489,000 and v514,991 as disclosing electric' remotes control and/orsupervisory sysitems which could .make use? of the presentinvenion.

An` electric signaling systemis known in which iniormation is conveyed 'by a train of impulses which vary individually in polarityl and length. The present application disclosesan equipment for the reception or such a train fof impulses.

The nature or delimitation of the invention is particularly, ascertained inthe claiming clauses of the statement of the inventionr claimed which ends this specication; whilst the .further description of the invention, and theparticular. description and ascertainment of the manner in which the invention is to be performed, will be provided in what now follows, showing, with the aid of the accompanying drawing, how best the applicants havebeen able, up to the present, tocarry the invention yinto effect.

The invention will be described with reference to the accompanying drawing,v in which:

Fig.v 1` shows the basic circuit of a receiver for trains oi impulseswhich mayvaryindividually bothinipolarity and in length; and- Fig, 2 show s the operation of this receiver by means of a time-chart.

Referring to Fig. 2, showingin a diagrammatic manner thel sequence of operations during receipt of` atiain of impulses, this train issupposed, for the salte of example, to consist of1 along seize pulse, a( short prepare pulse, six code pulses, and amarking out pulse, the fourth codek pulse being lengthened. The polarity ofthe individual pulses maybe ignored for themoment, since the operaf tions 4are those dependent upon they common relay The impulses areassumed to have a 5.0;59pratio, with the long 'code pulsesthree times the length of the short.

Atthe arrival of an impulse train, relayeIP or IN, responding to 'a .signal of the properpolarity received over the line L, `is energized. Either relay IP or IN operates relay IR which, in turn, energizesthel slow-releasingV relay G which remainsenergized until the final de-energization o i relay IR at the end ofy an impulsetrain'.,

During thee seizing impulse, relay.y Cw remains cle-energized. Itsy energizing circuit contains contacts SRON which aref closed in the home positionA andopened in any other positionY of switch S R In series-With contacts SRON are relayv contactsk G1 and contactsIRl which are openedE whenIRvis energized and closed WhenIR is-deL-energized.

In the first case, IRI' is disconnected fromrits front contactlthrough the pressure exerted bythe baci;V contact of against its` associatedy front Contact,

Atv the end of these'izeimpulse, relay IR, isgreleased and. thereby Slow-releenine.relayv C ist energized viacontacts SRON. which are `still closed. Relay C remainsoperatedover itsown contacts C3 via: minusfbattery, relay C, contacts C33, G2., IRI', plusbattery: its'release time is such that it releases during the marking-out pulse when IRI? is held open for ai time exceeding the length of the individual code pulses.

At the beginning of the second` and of each subsequentimpulse, relay, IRis energized and the magnet SRM `becomes energizedl via contacts CI and IRI. Switch SR whichv stands normally on its first or home contact is made to take one step upon de-energization so that during each subsequent impulse ,itswipersvSRI, SR2, SR3, and SR4, stand in differentpositions on their associated Contact banks. When relay G releases after the marking-out pulse, then magnet SRM is under, control. of wiper SRI through stepping contacts ST and theswitch SR returns to normal.

`Withthe operation of relay G, relay PI is energized via contacts C2 and GI. The coil of relay Pl, after the first release of relay IR, remains energized via: minusvbattery, relayPI, IR2, G2,

plus battery. Thereafter, it is disconnected by 1 each subsequent energization of IR whether short or long, by the opening of back contact IR2. Pendulum contact PII in itsoperation lags behind the energization and de-energization of the coil and swings back and forth at its natural frequency between Athe two v'fixed contacts, whenthe co'ilis def-energized. This occurs during thelong duration pulse following the rst three code pulses of normal duration. During this long code pulse, pendulum contactj PI continues to swing and therebytransmits a positive signal lto bank contacts LPM via: SR4, Pllright, PMI, IR2 front` GI, plus battery.

Relay PM itself y is venergized ,whenever PI is cle-energizedi. e., when pendulumcontact yPII is in itsleft-hand position. It will V normally not be energized when PI I is in :its 'right-hand position, except via contacts PMI, IR2 front, i. e.Y during the long duration impulse and during the marking-out impulse.

Each time relay PI is energized by the release of relay IR the pendulum contact PII is connected to the wiperSRd of the switch SR, but no potential is delivered to this wiper because relay PM releaseswhen relayY PI is energized thus V2,39'23596 j i' s opening contacts PII and therelea'se of relay" IR opens contacts IR2 front. d relay IR is held up by an incoming pulse longer than the period of the pendulum relay PI, the

pendulum contacts PII of Vthis` relay .continue to However whenl Y tional natural oscillations when a code pulseY is of Ylonger than normal duration, and armature contacts operated by said additional oscillations to energize at least'one of said code-operated circuits.

Y 3. A receiver according to claim l, wherein the armature of said pendulum relayY is adapted, following an energization, to execute one oscillation between opposite stationary contacts, and to con,-

tinue oscillating for a time after said energization has ceased,

close intermittently because of the natural swing i of the pendulum without theenergiz'ationof relay PI. Because relay IR is operated, .relay PM remains locked over contact PMI, front contact V4. `A receiver according to claim 1, wherein said code-operated circuit means consists of a pulse- `operated multi-bank sequence switch, each bank Vhaving a series of stationary gontacts and a wiper y arranged to be moved along said contacts, one of IR2, and contact'GI to plus battery, and this same circuit applies a positive potential to Wiper j SRA each time the pendulum contact PII touches the right xed contact. .These intermittent positive potentials .will continue Yto be applied for the remainder of the duration of the long incoming 1 pulse While the` wipers of switch kSR remain in of the PPM bank or the NPM bank through Wipers SR2 and SRS, depending on whether the pulses are positive or negative. As long as short pulses continue to come in no potentials are Vapplied to Y the contacts of the LPM bank, but when a long pulse is received then pulses `of positive potential are delivered tothe particular contact 0fA this bank upon which wiper( SR1!4 is restingat theV time by the free Operation "of pendulum contact PI I, thernumber'ofpulses beingldetermined by the length oi the incoming long pulse'. y c

When more than one train of impulses are received in succession, relay G is not released un- Vtil'the end ofall of these, andthe above cycle is repeated for each subsequent train."

.What is claimed is: f V V l, A receiverrfor a'series of successiveelectrical code pulses, comprisingY relay circuitrmeans controlled bythe pulses andr controlling code-oper- Yated circuit means, including ra pendulum relay said wipers being connected to receive pulses derived from positive code pulses, a second wiper being connected to receive pulses derived from negative r,code pulses, and a third wiper being connected to receive pulses controlled Yby additional oscillations of thependulumrelay.

5; A receiver for a series of successiverelectrical code pulses of different polarity and length, comprising a pair of receiving relays across a' signal circuit'and connected to be operated by positive and negative code pulses respectively, a repeater relay having two energizing circuits each controlled by one of the receiving relays; a iirs't series of distributor circuits derived from said pulses and controlled by one of said receiving relays to indicate the positive r'characteristic of a 'code pulse, a second series of Vdistributor circuits derivedY from said code pulses and controlled by the other of said receiving relaysrto indicate the negative characteristic of arcode pulse; a third series of distributor circuits derived.irom'saidV code pulses, a pendulum relay having an energizingY circuit to be energized by said repeater relayY dur ing intervals of said code pulses, and'having an armature adapted, upon energization, to execute a naturalV oscillation for substantially the normal durationof a code pulse, and'to execute additional natural oscillations after said energizing circuit has been cie-energized for' an 'extended code. pulse of moreV than normal duration, penduhaving an armature adapted, upon'energization y derived from intervals between said 'code pulses,

to execute a Vnatural oscillation'for substantially 3 the normal duration of a code pulse, and to execute additional natural Voscillations when deenergized for4 the duration of an extendedpulse of more than normal length, and circuitmeans controlled by at 'least' some of said additional 1 c oscillations toproduce a signal indicative of said extended code pulse.

' 2. A receiver Yfor aseries of successive electrical code pulses, comprising'relay circuitmeans con-V trolled by the pulses and controlling a numberof l code-operated circuitsrcorresponding to said series of code pulses, distributor means operated by f said relay circuit means to connect successivelyY said relay circuit means with said codefoperated l circuits, a pendulum relay controlled by said ciri cuit means and having an armature adapted, during intervals between said code pulses, to execute Y' a natural oscillation for substantially the normal duration of a code pulse, and 'to executeaddilum relayv contacts controlledV bysaidadditional oscillations and Acontrollingr said thirdi series oi distributor. circuits to indicate the llength Voi aY code pulse, said energizngcircuit Vbeing .energized when a repeater relay is operated bythe seize pulse, and a further relay operated by Asaid pendulum relay' to preventsaid energizing Vcircuit from being energized when deenergized.

.6.Y A receiver according to claim 5, vvhereinsaidV distributor circuits form part of a pulse-operated multirbankrstepping switch, operated by contacts of the repeater relax/,interruptingY theY pulse currentfor each pulse Vof th`ecode said Ystepping switchcomprisingirst and Ysecond banks. of con# tactsrsuccssive contacts oi which, infeach'ofthe` successive positions ofthe switch, are connected toreceiving relays operatedv by negative and positivercode pulses, respectively, `to'indicate the polarity of said code pulses, saidlrsteppin'g rswitch furthericomprising a third` bank of contactafsuccessive contacts4 of which, in each of the ysuccessive positionsof 'the"switch, Vare connectedto pendulumfrelay Vcontacts to 'indicateQthe length' ofsaid codepulse.`A 'i Y Y Y i 7. A receiver according toY claimV 5, wherein said distributor circuits formpartioi 'a pulsed-operated multi-bank stepping switch operated'- by contacts ofthe repeaterrrelay interrupting the pulseV cursaid repeater relayis rent for each pulse of the code, said stepping switch comprising a bank having a h'ome position circuit operating slow-releasing relay means under the control of seize and prepare pulses preceding the code pulses, and operating a further relay to prepare a circuit connection between contacts of the pendulum relay and a, further contact bank of said stepping switch as soon as the repeater relay is operated by pulses constituting the code.

8. A receiver according to claim 1, wherein said relay circuit means consists of two relays connected across the transmission line, each' connected in series with a rectier so as to respond to pulses of opposite polarity.

9. A receiver according to claim 1, wherein said relay circuit means consists of two relays connected across the transmission line, each connected in series with a rectier so as to respond to pulses of yopposite polarity, and wherein said distributor means consists of a pulse-operated multi-bank sequence switch, each bank having a series of stationary contacts and a wiper arrangement to be moved along said contacts, two of said wipers being controlled each by one of said two relays and connected to receive pulses derived from negative and positive code pulses, respectively, a third wiper being connected to receive signals controlled by additional oscillations of said pendulum relay.

10. A receiver according to claim 1, wh'erein said relay circuit means consists of a repeater relay having contacts to control a first slow-releasing relay, said first slow-releasing relay being connected to operate contacts controlling a second slow-releasing relay at the end of the Iirst pulse received, said second slow-releasing relay connected to control the current supply for the sucessive operations of said code operated circuit means and for the circuit means controlled by additional oscillations of said pendulum relay.

HAROLD MOUNTJ OY MUSCHAMP DASSIS-FONSECA. HUGH JENNINGS WARD. 

